轧辊表面镀铬对冷轧变形区润滑的影响

模拟轧辊表面镀铬工艺,对镀铬轧辊及非镀铬轧辊在同一润滑介质条件下对辊缝变形区润滑的影响进行了研究。结果表明,在同一润滑介质下,钢-钢摩擦副与钢-铬摩擦副的摩擦系数及润滑油成膜性能均有明显不同。钢-铬摩擦副的摩擦系数比钢-钢摩擦副的摩擦系数降低20%以上,在其它实验参数相同的条件下,冷轧润滑油在镀铬表面所形成的油膜厚度比非镀铬表面提高1倍以上。

On the Concept and its Relation of the Officialand the Country Staff'

The official and the country staff were two concepts used in the respective domain and had different consideration based on the goal of regulation of criminal law and administrative law.The connotation of these two words was also changing with the social development after the legislative definition fixed and used universally.From the relationship between these two words,the concept and the extension of the country staff were bigger in criminal law than the concept and the extension of the official in the ad...